Login impossible with umlauts im password via crowd integration

Description:

Crowd integration fails with umlauts in password

Server Setup Information:

• Version of Rocket.Chat Server:
  0.57.2
• Operating System:
  Ubuntu 14.04, but i'm running the docker-container
• Deployment Method(snap/docker/tar/etc):
  docker
• Number of Running Instances:
  1
• DB Replicaset Oplog:
  none, running on a single db (while evaluating)
• Node Version:
  what ever is shipped in the rocketchat/rocker.chat container

Steps to Reproduce:

1. set up crowd integration
2. have umlauts in your password
3. try to log in

Expected behavior:

i would expect login to work with umlauts in the password

Actual behavior:

login is impossible with umlauts within the password.
it's surely this issue.
its reproduce able with all users, in many iterations.
change password to 7bit asci: works, change password to have umlauts: fail, change back to 7bit ascii: fail.

Relevant logs:

rocketchat_logger rocketchat_logger.js:377 CROWD ➔ info Init CROWD login $username
rocketchat_logger rocketchat_logger.js:377 CROWD ➔ info Going to crowd: $username
rocketchat_logger rocketchat_logger.js:377 CROWD ➔ error Crowd user not authenticated due to an error, falling back
rocketchat_logger rocketchat_logger.js:377 CROWD ➔ info Fallback to default account system { username: '$username' }

I know about the workaround "just don't have umlauts in your password", but our it security officers it telling out employees to have "strong" passwords ans actually encourage them to use all kind of chars within their passwords.